| 摘要 |
PROBLEM TO BE SOLVED: To provide a loosening prevention screw applying a spring property to a tip part of a thread to improve a loosening prevention effect.SOLUTION: In an advance side flank and a pressure side flank of a thread of a male screw, a flank angle of the advance side flank is larger than that of the pressure side flank, the thread has a spring property, and a tip part of the pressure side flank of the male screw contacts with a female screw flank in fastening the male screw. |
